直交梁とピン接合された無耐火被覆完全合成梁の載荷加熱実験: 梁端ピン接合を有する合成梁の火災時耐力に関する研究その1

摘要

本研究では，直交大梁とピン接合された無耐火被覆完全合成梁の載荷加熱実験を実施し，火災時たわみ挙動および火災時耐力について考察を行った。本研究で得られた知見を以下にまとめる。①常温載荷時のピン接合梁の荷重-たわみ関係は単純梁に近い挙動を示したが，火災加熱時には梁端ピン接合部での回転拘束効果によりたわみが大きく抑制された。%In the case of steel-concrete composite beams pinned with steel girders, when the beam ends are rotationally restrained by the girders, reinforcing bars in the concrete slab work effectively so that the hogging moment resistance at the pin joints may be exerted considerably. In order to investigate the effect, load-bearing fire tests of unprotected fully composite beams pinned with steel girders are conducted. As a result, the deflection was suppressed by the restraining effect against rotation at the pin joints, and the fire resistance was greatly improved compared to the simply supported beam.